AGARWAL, A. . Contra-Closed, Co-Orthogonal Functionals and Elementary Model Theory. International Journal on Recent Trends in Life Science and Mathematics, [S. l.], v. 8, n. 3, p. 19–28, 2021. Disponível em: https://www.ijlsm.org/index.php/ijlsm/article/view/155. Acesso em: 28 mar. 2024.